Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

PHP Build a Basic PHP Website (2018) Building a Media Library in PHP Adding Active States to the Navigation

Oliver Sewell
Oliver Sewell
16,425 Points
Posted by Oliver Sewell
Oliver Sewell
16,425 Points

why do we use a space before the on class

` echo " on";

??

2 Answers

Jason Anello
Jason Anello
Courses Plus Student 94,610 Points

Hi Oliver,

There's already a class name there, for example, class="books"

If you don't put the space before "on" then the new class value would be "bookson"

Instead we want it to be "books on" with a space between. It's 2 separate class names.

Oliver Sewell
Oliver Sewell
16,425 Points
Oliver Sewell
Oliver Sewell
16,425 Points

Thankyou for the speedy answer

Charlie Guan
Charlie Guan
7,284 Points
Charlie Guan
Charlie Guan
7,284 Points

Or, instead of saying 

echo ' on'

you can also do it like this:

<li class="books <?php if ($section == "books") {echo "on";} ?>">

Leave a blank space between books and the opening tag of php code.